/*-
 * #%L
 * Elastic APM Java agent
 * %%
 * Copyright (C) 2018 - 2019 Elastic and contributors
 * %%
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * #L%
 */
package co.elastic.apm.agent.configuration.source;

import org.stagemonitor.configuration.source.AbstractConfigurationSource;

import javax.annotation.Nullable;

/**
 * A variation of {@link org.stagemonitor.configuration.source.SystemPropertyConfigurationSource} (under Apache license 2.0)
 * which does not initialize a logger.
 * <p>
 * This is important when using this configuration source to configure the logger.
 * </p>
 */
public class SystemPropertyConfigurationSource extends AbstractConfigurationSource {

	@Override
    @Nullable
	public String getValue(String key) {
		try {
			return System.getProperty(key);
		} catch (SecurityException e) {
		    e.printStackTrace();
			return null;
		}
	}

	@Override
	public String getName() {
		return "Java System Properties";
	}
}
